I would also avoid assuming you can settle every defect through repair credits later. A cleaner approach may be to price known updating into the initial offer, then reserve further negotiation for genuinely new findings. Otherwise the seller may hear “10% below now, then another reduction...
I would first ask whom the agent is contractually representing and what duties they say they owe to each side. Get the answer and any conflict disclosure in writing. Also ask whether either party’s fee changes, who receives confidential information, and whether the same named contact will...